Hormone — Hormones (from Greek Polytonic|ὁρμή impetus ) are chemicals released by cells that affect cells in other parts of the body. Only a small amount of hormone is required to alter cell metabolism. It is also a chemical messenger that transports a… … Wikipedia

Prodrug — A prodrug is a pharmacological substance (drug) administered in an inactive (or significantly less active) form. Once administered, the prodrug is metabolised in vivo into an active metabolite, a process termed bioactivation. The rationale behind … Wikipedia

Listeriolysin O — (LLO) is a hemolysin produced by the bacterium Listeria monocytogenes , the pathogen responsible for causing listeriosis. The toxin may be considered a virulence factor, since it is crucial for the virulence of L. monocytogenes . [cite journal… … Wikipedia

digestive system, invertebrate — ▪ anatomy Introduction any of the systems used by invertebrates for the process of digestion. Included are vacuolar and channel network systems, as well as more specialized saccular and tubular systems. Comparison of unicellular and… … Universalium